It seems when iam in the ohio area i don't get an antenna lite when trans mitting. i had one when i was in the tennesee area or down in that area, but when i was in the pa. area or when i got back to the ohio area, i lost the antenna lite when i transmitted. this could be just a fluke, but i want to find out how to calibrate the swr on the radio. is it something in the radio that i have to adjust, like how i calibrate it on the cal button, or is it something with the antennas. the antennas were on the truck. it is a freightliner antenna setup. i think one antenna is a fire stick and the other is a k40 with 2500 watts capibility. ican adjust the top of the k40. i am not sure about the fire stick. can you help me understand and learn to fix this problem myself? thanks for your help. steve
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Re: no antenna lite when transmitting
Antenna light should be a warning indicator for high VSWR..... simple rule of thumb for CB antenna.... the lower the frequency "channel" the longer the antenna length, higher the frequency "channel" the shorter the antenna length. Your vehicle is a ground plane, where you mount the antenna will also affect its operation and tuning. A properly tuned antenna will have lower reflection on the midband channels and gradually rise as you near the upper and lower end of the band. Some base loaded antennas will be noticably narrow in bandwidth, if you have that problem then tune it for the channel you use most! K40 has always been good for easy tuning and band coverage, center it on the vehicle top for good omni coverage! PS... always make sure your connectors are secure, a loose shield will ruin your day when adjusting SWR!
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The mounting and adjusting of the antenna is crucial,if it is a magnet mount,the surface must be clean,dry and best to not have any rust,also bottom of the magnet needs to be clean and mount it to the largest area of metal on the vehicle...the trunk lid,middle of your roof are the best.Permanent mounts need to be touching bare metal at the mounting hole not paint,again either mount requires SWR adjustments to match the radio it's attached to,it may require trimming of the metal"whip" if it needs to be lowered for the best reading,also don't rule out the radio chassis might need to be grounded as well.For general safety I would not recommend touching an antenna while it is transmitting any radio signal...if all above is good,you transmit and receive fine,more likely light is faulty or needs it's sensitivity adjusted...Good luck,hope this info helps.
Make sure you don't try to transmit without a proper CB antenna, it will damage & blow out the power transistors! If you have another CB close by, try listening without the antenna attached If you even faintly hear whats transmitted by the other CB, your antenna cable is probably shorted out... AGAIN don't try to transmit with no antenna or a shorted cable it will damage the unit!
This problem is usually one of two things. Check the antenna coaxial cable and connections first, to be assured there are no shorts. That's one of the symptoms of receive and no transmit. The other would more than likely be a defective RF Transmitter stage in the final amplifier circuit. That could be a defective (blown or shorted) Power Transistor or IC (Integrated Circuit) Module.
After checking the antenna and coax, key the Radio up and look for any meter or indicator sign of TX (Transmitted power). If you have a power meter, use that for power and SWR (Standing Wave Ratio which should be close to 1:1 ratio) checks of the radio and antenna system. If there is no power, then you will need Technical help from a Professional at a repair facility, unless you are familar with this work. The antenna problem, if it exists...you should be able to fix.
Let me know when you get this fixed, and contact me again for more help. Thanks.
Center the antenna on the vehicle, then check the SWR on channel 1 and channel 40. with the switch in CAL position, key radio and use the swr/cal knob to
set the meter so the needle is just touching the end of the red area on
the right-hand side of the meter. Once calibrated, unkey and switch
the switch to SWR and key up again. The lower the reading, the better. If the SWR is Higher on 40,
the antenna needs to be shorter.. if its higher on 1, then the antenna
needs to be longer.
if it dont transmit period on AM, then there's an internal glitch :)
I would recommend that you put an swr meter (CLICK HERE) between the radio and the antenna to see if your radio is transmitting anything at all. Also, it will check to see if your radio is correctly matched to your antenna. If your antenna is not matched correctly it will fail to transmit correctly.
there could already be some damage to the final transistor already, it may be why the light stays on. Tune the antenna according to the article and then if the light stays on again, there may be something wrong with the radio, or the warning light is not adjusted correctly.
If your swr is okay, then turn vr6 all the way down so the light does not come on.
may be u burned yr final transistors...check if yr antenna is well grounded and try just after this to transmit, if the indicator is not stable on the green area when you are in "am" modulation stop to try and bring to the assistance
if the red ant light comes on this means that you have antenna trouble either in the antenna itself or the coax but this should not have anything to do with the radio not transmitting. it sounds to me that you have a bad audio chip or a bad power output transistor. in either case you should really take it to a cb shop and let the professionals solve your problem, good luck!!